2000 echo, with DC 15" (my first build)

Hey guys, so here is my first build, nothing fancy as I am pretty new. I struggled designing a box that would fit into my trunk, but after three or four designs I decided to go with a angled enclosure, max i could get was 6 cf tuned at 34hz....but they work perfect.....couldn't find any arrows yet but I have not had any pipe whistle......

the set up is, 2 15" DC level 4's powered by the MB quart 2000.1 wired at .5